Inquizitve CH 19

Under which circumstances will a population be most likely to exhibit logistic growth?

when sources are scarce

The carrying capacity of a habitat does not change.

F

Which of the following are examples of factors that lead to density-dependent population changes?

scarcity of food spread of deasdise predation

A population size can be much lower than the carrying capacity for an extended period of time.

t

Which of the following statements best describes the characteristics of density-dependent population changes?

... such as competition and predation

When will the biggest difference in growth rates between a population that exhibits logistic growth and one that exhibits exponential growth be seen?

...the two populations have been growing for many generations

A population of 200 deer is reintroduced to a forest after many years of being absent. This population is tracked for the next 50 years. Based on the following data of the first 50 years, and assuming that there is no resource limitation, how many deer would you expect to find in this population 60 years after their introduction?

1,600 deers

The amount of time needed for a population to double in size is called generation time. Based on this graph, the generation time for the Earth's eagle population is approximately how many years? (Round to the nearest number ending in 0 or 5.)

10

What is the approximate doubling time of the population whose growth pattern is shown in this figure?

10

The table below shows the size of a population of palm trees in a swamp over a 25-year period. What is the doubling time of this population in years?

10 years

The doubling time of a population of spiders is 1 month. A hypothetical population starts out with 100 individuals. Assuming that there is no resource limitation, how many months would it take until there are 400 spiders in the population?

2 months

You build a pond in your backyard, and stock the pond with four koi fish. After two years, there are eight koi fish in the pond. What is the doubling time of the koi population in years?

2 years

A population of paramecia grows from 16 to 128. How many generations, or doubling times, has this population undergone?

3

A population of paramecia grows from 16 to 64 in six days. What is the doubling time for this population?

3 days

Based on the graph below of a population of goats over the 50 years since they were introduced to an island, what is the likely carrying capacity of the island for the goats?

300

Zika virus is transmitted from mosquitoes to humans. The graph below describes the growth rate and carrying capacity of humans. Using this information, what number can we infer the carrying capacity of mosquitoes to be?

>10

Determine whether the following conditions will increase or decrease a population of mountain lions (predators).

A deer population doubles from the previous year due to a prolonged plant growth season and abundant foliage for grazing. A local neighborhood boy releases a pair of rabbits into the wild. They reproduce rapidly and dramatically increase the rabbit population in the area.

The figure below shows the growth of the global human population. Which of the following statements regarding this pattern is true?

Earth's carrying capacity for humans may be above the current human population size. Current human population growth is exponential.

Determine whether the following conditions will increase or decrease carrying capacity for the given population.

Members of a local nonprofit organization add large woody debris to a local stream, providing more locations for salmon and trout to hide, feed, and breed. A researcher triples the number of bird boxes in an area populated by blue birds, obligate cavity nesters that cannot make their own cavities and rely on vacant cavities for nesting.

Which of the following is correct regarding genetically modified ("friendly") Aedes aegypti?

Since the carrying capacity remains unchanged, a species other than Aedes aegypti may possibly increase in numbers. The population decrease in GM Aedes aegypti is unrelated to carrying capacity.

Every few decades, extremely low tides lead to coral reefs becoming exposed to the dry air and sun. Which of the following statements regarding extremely low tides is likely to be true?

The low tides result in a density-independent population change. The population size of corals is likely to decrease as a result of these events.

Which of the following variables affects the carrying capacity of a habitat of burrowing mice?

amount of resources avablible to mice

Single-celled organisms that reproduce rapidly are excellent models of population growth. Using laboratory growth media, a population of paramecia first experiences - growth, which occurs when a population increases by a constant proportion over a constant time interval. This type of growth is represented by a(n) - growth curve. However, as resources become limited, growth slows and levels off as the population reaches - . This type of growth, in which the paramecia experience exponential growth at first but then stabilize at the maximum population size that can be sustained by the culture media, is called - growth and is represented by a(n) - growth curve.

exponential, J-shaped, carrying capacity, logistic, S-shaped

During logistic population growth, the population grows freely with no constraints.

f

For a given population, population density is always a larger number than population size.

f

Most habitats can sustain a population size that is much higher the carrying capacity for an extended period of time.

f

Severe weather conditions are more likely to be caused by populations with high population density.

f

The size of natural populations can - . These changes can be caused by a variety of factors. For example, when the death rate of a population increases, the population size is likely to - . The death rate of a population is influenced by the available resources in a population, which is in turn influenced by the - and is therefore said to be a - factor. Other factors, such as extreme weather events, can also influence population size. These factors are said to be - because their occurrence is not brought on by the parameters of the population itself.

fluctuate, decrease, population density, density- independent

Which of the following are population density-dependent factors?

inatably to find mates

Consider a population of birds, living in a forest, that nest within the branches of oak trees and feed on beetles and earthworms. Which of the following would likely reduce the carrying capacity of the birds?

introducing to the forest a rodent species that eats earthworms cutting down oak trees in the forest

What shape of curve describes free, unconstrained population growth?

j shaped

Among the four populations described below, which has the largest population size, and which has the largest population density? Each Selection is only used once.

large populations size: A population 200 frogs living in a 200 square foot pond large population density: A population of 50 ants living in a one square foot burrow

The curve demonstrates logistic population growth of paramecia. This population of paramecia experienced a period of rapid growth followed by a period of no net growth. Match each time period with its correct description. Note that targets may accept more than one label.

left side: The parameciahave sufficientnutrients andresources tosupport growth The populationis growingrapidly.

The table below shows the size of a feral cat population in a city over a 40-year period. Does this population exhibit logistic or exponential growth?

logistic

Match each label with the description or figure it is best associated with.

logistic growth: blue graph and At some point in time, the rate of population growth begins to slow down. exponential growth: red graph and The rate of population growth continually increases.

The size of a population of wildflowers remains relatively unchanged over 20 years. This population is likely displaying what type of growth pattern?

logistical

Which pattern of population growth is affected by the carrying capacity?

logistical

Which phase(s) of mosquito larval growth and/or carrying capacity would be impacted by the release of genetically modified Aedes aegypti?

middle curving part and the beginning of the line

A population is a group of individuals belonging to - species that interact with one another. The total number of individuals in a population is the - . On the other hand, the number of individuals per unit area is the - .

one poluation size population density

A population of deep sea crabs lives in marine worm burrows and eats decaying matter falling from shallow-water biological communities above. Which of the following would likely decrease the carrying capacity of these seafloor crabs?

pollution disrupting the shallow-water biological communities above the crab habitat invation of a fish that preys on worms

A population of 350 ants inhabits a single tree in a forest. One hundred of the ants migrate to a nearby tree but remain in the same population. No new ants are produced in this process. Which of the following measures changed when the ants invaded the new tree?

population density

Which of the following measures would be affected by adding 100 individuals to a population of birds that inhabits an entire small island?

population density and size

If the number of voles dramatically increases, which of the following may also increase?

red fox, cayote, grey wolf

When a natural population is first established in a new habitat, it usually has a - population size. During the first few generations, the population growth rate is likely to be - . After many generations, the population growth rate will likely begin - due to - resources. The maximum number of individuals that the habitat can support is called the - , which is a feature of the - .

small increasing decreasing scarcity of carrying capacity habitat

Populations of small size can have high population densities.

t

Predation rates on a population often increase as population density increases because many predators prefer to hunt food sources with higher abundance.

t

Suppose the size of a population doubles. What is required for the density to double as well?

the areas that population occupys must not change

The figure below shows a view from above of two natural populations, 1 and 2. The individuals in both populations are indicated by red dots, and the area of the four square grid shown for the two populations is the same. Which of the following statements regarding these two populations is true?

the size of the population 1 and 2 is the same, but the density of population 1 is higher

If Canadian lynx were bred in captivity and released into the wild, the hare population would be expected to decrease in response.

true

The following image shows a food chain where wolves are the top predators and prey on the elk, which eat the plants. If the elk population were to significantly decrease, which of the following is likely to occur?

wolf population will decrease and plant population will increase